Blade construction for paddle wheels



June 30, 1925. 1,544,134

.1. A. DAVID BLADE CONSTRUCTION FOR PADDLE WHEELS Filed Juiy 2 19 24 g 4m ii.

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-Z 6 ffifid/vzd Patented June 30, 1925.

UNITED STATES JOSEPH A. DAVID, OF ELIZABETH, NEW JERSEY.

BLADE CONSTRUCTION FOB, PADDLE WHEELS.

. Application filed July 25, 1924. Serial No. 728,182.

To all whom it may concern:

Be it known that I, Josurn A. DAVID, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in a Blade Construction for Paddle Wheels, of which the following is a specification.

This invention relates to new and useful improvements 'in blade construction in paddle wheels has for its principal ob ject to provide a simple and efficient means for preventing eddy current as the blades of the paddle wheel strike the water.

A further object of the invention is to provide a blade construction for paddle wheels of the above mentioned character, which will permit the blades of the paddle wheel to pass through the water without causing any great amount of disturbance and for increasing the propulsion of the vessel on which the paddle wheelis mounted.

A further object of the invention is to provide a blade construction for paddle wheels of the above mentioned character, which is simple in construction, inexpensive, strong and durable and furthermore adapted for the purpose for which it is designated.

Other objects and advantages of this invention will become apparent during the course of the following description.

in the accompanying drawing forming a part of this specification and in which like numerals designate like parts throughout the same:

Figure 1 is a front elevation of my improved blade construction.

Figure 2 is a side elevation thereof, and

Figure 3 is a transverse section taken approximately on line 3-3 of Figure 1.

In the drawing wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates generally my improved blade for use in connection with paddle wheels, the same being substantially diamond shaped in cross section as is clearly illustrated in Figure 8. The front faces 2 and 3 respectively of the blade 1 are slightly concaved as are also the rear faces 4E and 5 respectively.

ing than the apex 8 of the rear faces 4: and 5.

The paddle wheel blades now universally 1n use are flat on their opposite sides and in this use a blade construction of this char.

acter often results in disturbing the flow of water in the back of the blade whereby a considerable amount of energy is wasted. By providing a blade construction of the character shown and above described, the eddy currents will be reduced and permit the blades of the paddle wheels to pass through the water without causing any disturbance in the rear of each blade. Furthermore, by having the faces of the blades substantially concaved, theflow of water will be smoothened but it will be necessary to have the front faces of the blade of less inclination than the rear faces, in order that the blades will be efiicient in carrying out the purposes for which the same is designated.

Notonly can a blade construction of the character above described be used in connection with paddle wheels but may be also used as a swimming appliance for creating a greater amount of energy than is ordinarily obtained by the hands of the swimmer.

While I have shown the preferred embodiment of my invention, it is to be understood that various changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention and the scope of the appended claim.

Having thus described the invention, what I claim is In a blade for paddle wheels, the same being substantially diamond shaped in cross section, the faces thereof being concaved, the apex of the front faces being nearer the longitudinal center than the apex of the rear faces.

In testimony whereof I afiix my signature.

JOSEPH A. DAVID. 

